scholarly journals Towards a High Rejection Desalination Membrane: The Confined Growth of Polyamide Nanofilm Induced by Alkyl-Capped Graphene Oxide

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 488
Author(s):  
Biqin Wu ◽  
Na Zhang ◽  
Mengling Zhang ◽  
Shuhao Wang ◽  
Xiaoxiao Song ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Interfacial Polymerization ◽  
Rejection Rate ◽  
Diffusion Resistance ◽  
Crosslinking Degree ◽  
Functionalized Graphene Oxide ◽  
Confined Growth ◽  
Tfc Membrane ◽  
High Rejection ◽  
Thin Film Nanocomposite

In this paper, we used an octadecylamine functionalized graphene oxide (ODA@GO) to induce the confined growth of a polyamide nanofilm in the organic and aqueous phase during interfacial polymerization (IP). The ODA@GO, fully dispersed in the organic phase, was applied as a physical barrier to confine the amine diffusion and therefore limiting the IP reaction close to the interface. The morphology and crosslinking degree of the PA nanofilm could be controlled by doping different amounts of ODA@GO (therefore adjusting the diffusion resistance). At standard seawater desalination conditions (32,000 ppm NaCl, ~55 bar), the flux of the resultant thin film nanocomposite (TFN) membrane reached 59.6 L m−2 h−1, which was approximately 17% more than the virgin TFC membrane. Meanwhile, the optimal salt rejection at seawater conditions (i.e., 32,000 ppm NaCl) achieved 99.6%. Concurrently, the boron rejection rate was also elevated by 13.3% compared with the TFC membrane without confined growth.

scholarly journals Enhancing the performance of thin-film nanocomposite nanofiltration membranes using MAH-modified GO nanosheets

RSC Advances ◽  
2017 ◽  
Vol 7 (86) ◽  
pp. 54898-54910 ◽  
Author(s):  
Quanling Xie ◽  
Wenyao Shao ◽  
Shishen Zhang ◽  
Zhuan Hong ◽  
Qiuquan Wang ◽  
...  
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Maleic Anhydride ◽  
Interfacial Polymerization ◽  
Water Flux ◽  
Functionalized Graphene ◽  
Nanofiltration Membranes ◽  
Functionalized Graphene Oxide ◽  
Salt Rejection ◽  
Thin Film Nanocomposite

In this work, novel thin-film nanocompostie NF membranes were developed through modification with maleic anhydride functionalized graphene oxideviainterfacial polymerization, which showed the enhanced water flux with retaining high salt rejection.

IMPACTS OF HYDROPHILIC NANOFILLERS ON SEPARATION PERFORMANCE OF THIN FILM NANOCOMPOSITE REVERSE OSMOSIS MEMBRANE

2016 ◽  
Vol 78 (12) ◽  
Author(s):  
C. Y. Chong ◽  
G. S. Lai ◽  
W. J. Lau ◽  
N. Yusof ◽  
P. S. Goh ◽  
...  
Keyword(s):  
Thin Film ◽  
Water Permeability ◽  
Interfacial Polymerization ◽  
Pure Water ◽  
Water Flux ◽  
Water Desalination ◽  
Separation Performance ◽  
Salt Rejection ◽  
Tfc Membrane ◽  
Thin Film Nanocomposite

The membrane technology is still considered a costly method to produce potable water. In view of this, RO membrane with enhanced water permeability without trade-off in salt rejection is desirable as it could further reduce the cost for water desalination. In this study, thin film nanocomposite (TFN) membranes containing 0.05 or 0.10 w/v% hydrophilic nanofillers in polyamide layer were synthesized via interfacial polymerization of piperazine and trimesoyl chloride monomers. The resultant TFN membranes were characterized and compared with a control thin film composite (TFC) membrane. Results from the filtration experiments showed that TFN membranes exhibited higher water permeability, salt rejection and fouling resistance compared to that of the TFC membrane. Excessive amount of nanofillers incorporated in the membrane PA layer however negatively affected the cross-linking in the polymer matrix, thus deteriorating the membrane salt rejection. TFN membrane containing 0.05 w/v% of nanofillers showed better performances than the TFC membrane, recording a pure water flux of 11.2 L/m2∙h, and salt rejection of 95.4%, 97.3% and 97.5% against NaCl, Na2SO4 and MgSO4, respectively. 

Inter-Capsule Fusion and Capsule Shell Destruction using Dynamic Covalent Polymers

2021 ◽  
Author(s):  
Yifei Wang ◽  
Khamila Quevedo ◽  
Emily Pentzer
Keyword(s):  
Graphene Oxide ◽  
Interfacial Polymerization ◽  
Pickering Emulsion ◽  
Functionalized Graphene ◽  
Graphene Oxide Nanosheets ◽  
Functionalized Graphene Oxide ◽  
Capsule Shell

Herein, capsule shells containing hindered urea bonds were prepared using interfacial polymerization in an oil-in-oil Pickering emulsion stabilized by functionalized graphene oxide nanosheets. After isolation and mild heating, the polymer...

scholarly journals High-Performance Nanosilver Thin Film Nanocomposite Membranes Prepared on Carbon Nanotube-Based Supports

2020 ◽  
Vol 24 (3) ◽  
Author(s):  
N. N. Gumbi ◽  
B. S. Mbuli ◽  
M. O. Daramola ◽  
S. D. Mhlanga ◽  
B. B. Mamba ◽  
...  
Keyword(s):  
Thin Film ◽  
Carbon Nanotube ◽  
High Performance ◽  
Interfacial Polymerization ◽  
Reduction Reaction ◽  
Membrane Performance ◽  
Tfc Membrane ◽  
And Performance ◽  
Escherichia Coli Bacteria ◽  
Thin Film Nanocomposite

Biofouling in membranes is a serious concern as it leads to a severe reduction in membrane performance by increasing the membranes’ resistance to permeate flow. This work describes a facile method for the production of high performance nanosilver polyamide thin-film nanocomposite (TFN) membranes on carbon nanotube-based supports for biofouling control. The TFN membranes were prepared by the interfacial polymerization of a thin polyamide layer over a polyethersulfone (PES) support layer. Nanosilver (nAg) particles were generated in-situ on the surface of the polyamide layer using a reduction reaction between a silver salt and sodium borohydride. The support layer of the TFN membrane contained nitrogen doped multi-walled carbon nanotubes (N-MWCNTs) at various dosages. The SEM/EDS microscopic analyses revealed that nAg particles were present on the polyamide layer and that they were evenly distributed throughout the TFN membrane. Furthermore, the TFN membrane showed an improved water permeability (from 16.74 L/m2.h to 22.86 L/m2.h at 150 Psi) without sever compromise in NaCl rejection (from 98.37% to 99.40%) compared to the bare TFC membrane. This was attributable to the combined hydrophilic effects imparted by the presence of nAg on the TFN polyamide layer and the oxidised CNTs in the support layer. Antibacterial tests conducted using Escherichia coli bacteria demonstrated that the TFN containing nAg particles membranes exude better antibacterial activity compared to the pristine TFC membrane as evidenced by a clear zone of inhibition, in the area surrounding the TFN membrane and the absence of bacterial colonies. The present study demonstrated that the presence of low dosages of CNTs in the support layer is essential in the improvement of mechanical strength and performance properties of the support layer, while nAg plays a crucial role in the enhancement of TFN membrane performance. 

scholarly journals A Novel Thin-Film Nanocomposite Nanofiltration Membrane by Incorporating 3D Hyperbranched Polymer Functionalized 2D Graphene Oxide

Polymers ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 1253 ◽  
Author(s):  
Quanling Xie ◽  
Shishen Zhang ◽  
Hanjun Ma ◽  
Wenyao Shao ◽  
Xiao Gong ◽  
...  
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Hyperbranched Polymer ◽  
High Performance ◽  
Interfacial Polymerization ◽  
Water Flux ◽  
Three Dimensional ◽  
Salt Rejection ◽  
Antifouling Ability ◽  
Thin Film Nanocomposite

In order to develop a high-performance thin-film nanocomposite (TFN) nanofiltration (NF) membrane, the functionalized graphene-based nanomaterial (GO-HBE-COOH) was synthesized by combining two-dimensional graphene oxide (GO) with a three-dimensional hyperbranched polymer, which was used as the novel nanofiller and successfully embedded into the polypiperazine-amide (PPA) active layers on polysulfone (PSU) substrates via interfacial polymerization (IP) process. The resultant NF membranes were characterized using ATR-FTIR, SEM, and AFM, while their performance was evaluated in terms of water flux, salt rejection, antifouling ability, and chlorine resistance. The influence of GO-HBE-COOH concentration on the morphologies, properties, and performance of TFN NF membranes was investigated. With the addition of 60 ppm GO-HBE-COOH, the TFN-GHC-60 NF membrane exhibited the optimal water flux without a sacrifice of the salt rejection. It was found that the introduction of GO-HBE-COOH nanosheets favored the formation of a thinner and smoother nanocomposite active layer with an enhanced hydrophilicity and negative charge. As a result, TFN NF membranes demonstrated a superior permeaselectivity, antifouling ability, and chlorine resistance over the conventional PPA thin-film composite (TFC) membranes.

Sign in / Sign up

Export Citation Format

Share Document